Explain the raster scan monitors, Computer Engineering

Assignment Help:

Explain the raster scan monitors

The refresh process must also be performed for raster scan monitors. Most television monitors are raster scan display devices : one scan-line at a time. Raster scan systems uses a memory buffer called frame buffer (or refresh buffer) in which the intensities of the pixels are stored. Refreshing the screen is performed using the information (intensity of each pixel) stored in the frame buffer. Frame buffer can be treated as a two-dimensional array. Raster display devices read the frame buffer and activate the three phosphor dots in the triad according to the value read from the frame buffer.

The entire contents of the frame buffer should be read and the pixels should be activated appropriately at a sufficiently high rate to avoid flickering of the picture. Depending on the persistence of the phosphor coated inside the screen, the monitors require different refresh rates. In some raster display devices, a frame buffer is displayed in two passes. This kind of refreshing is called interlaced. In the first pass the odd rows are refreshed, while the even rows are refreshed in the second pass. Thus, the screen is refreshed in half the time. Though this approach does not really increase the rate of refreshing the screen, but is quite effective in reducing the flicker.

 


Related Discussions:- Explain the raster scan monitors

Explain the fetch cycle, Q. Explain the Fetch Cycle? The beginning of e...

Q. Explain the Fetch Cycle? The beginning of every instruction cycle is the fetch cycle and causes an instruction tobe fetched from memory.   The fetch cycle comprises four

Expalin johnson counter, Write short note on the Johnson counter. Ans:...

Write short note on the Johnson counter. Ans:  Johnson Counter: It is a synchronous counter, where all flip-flops are clocked concurrently and the clock pulses drive the

What is assembly language, What is assembly language? Assembly languag...

What is assembly language? Assembly language : It is a family of low-level language for microprocessors, programming computers, microcontrollers etc. All are implement a symbo

JSP, What is java server pages

What is java server pages

Define underflow and overflow, Define underflow and overflow. Underflow...

Define underflow and overflow. Underflow: If the result the arithmetic operation including n-bit numbers is too small to show by n-bits, underflow is said to occur. Overflow

What is the significance timescale directive, What is the significance Time...

What is the significance Timescale directive? Defines time units and simulation precision (smallest increment). Syntax 'timescale TimeUnit / PrecisionUnit TimeUnit =

What is artificial intelligence neural networks, For the sake of trying to ...

For the sake of trying to make intelligent behavior though really all that's being done is work with artificial neural networks where every cell is a very easy processor and the go

Explain about diodes, Q. Explain about Diodes? A single pn-junction wit...

Q. Explain about Diodes? A single pn-junction with appropriate contacts for connecting the junction to external circuits is called a semiconductor pn-junction diode. The fundam

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd